Collect. Czech. Chem. Commun. 1983, 48, 2569-2575

Analysis of the system precipitation-separation unit. Effect of filtration pressure drop on relation among filtration properties of suspensions and reaction conditions at precipitation

Otakar Söhnel

Chemopetrol, Research Institute of Inorganic Chemistry, 400 60 Ústí nad Labem


Filtration characteristics of BaCO3 and SrCO3 suspensions precipitated batchwise at differing conditions were studied in dependence on the used filtration pressure drop. Both compounds form compressible filtration cakes whose behaviour is described by an exponential function. Parameters of this function determined experimentally for ΔP = 20 to 80 kPa are given. Theoretical relation between initial supersaturation at precipitation and filtration resistance of the formed suspension (Eq. (14)) hold for both compounds in the whole studied range of filtration pressure drops ΔP from 20 to 80 kPa. Two groups of compounds were found; for the first one the parameters of Eq. (14) are not a function of ΔP, whereas for the second one the dependence of parameters in Eq. (14) on ΔP is significant.